Automating abuse routing in a SOC pipeline
Once a team handles more than a few dozen abuse cases a day, looking up contacts by hand stops being a task and becomes the bottleneck. The lookup itself is mechanical. The decisions around it are not, and a pipeline that automates the mechanical part while leaving the decisions to an analyst is the one that survives contact with real cases. These are the design choices that matter, learned from building and running one.
Where the lookup goes
Enrich at ingest, not at send time. When a URL enters the queue (from a feed, a user report, a detection), resolve the domain and fetch the registrar and network contacts immediately and attach them to the case. By the time an analyst opens it, the routing question is already answered and the case shows: registrar and its abuse mailbox, each hosting network and its abuse mailbox, whether a CDN fronts the site, and the domain's registration date.
Doing it at ingest has two benefits beyond speed. The data is captured while the infrastructure is still up; phishing hosts change within hours of a campaign being noticed, and a lookup at send time may describe a site that has already moved. And the analyst's time goes on the judgement call, not on four curl commands.
What one lookup involves
For a single domain, a complete answer needs: DNS resolution (A, AAAA, and CNAME to see the proxy), the registry RDAP record for the registrar and its abuse contact, one RIR RDAP record per resolved IP for the network abuse contact, and a classification step that decides whether the network contact is the host or a CDN. On a typical phishing domain that is one DNS round, one registry query and one or two RIR queries. On a large brand site it can be eight RIR queries. The registries are the slow and fragile part; DNS is fast and DNS is yours.
Cache like you mean it
Registries publish this data for free and can stop serving you if you hammer them. Cache per observation, not per whole answer:
- Network ownership for an IP: 24 hours. Allocations rarely change.
- Registrar record for a domain: 1 hour. Long enough to absorb the same domain arriving from three feeds in an afternoon.
- DNS: honour the TTL, and store what you resolved and when, because that timestamp goes in the report.
Cache in memory with a bound and an eviction policy. Do not write registry responses to a database that outlives the cache; the registries' terms distinguish between using their data and compiling it, and a persistent store is compilation.
Rate limits and politeness
Each RIR has its own behaviour. ARIN refuses a second simultaneous new connection from the same source; the fix is one in-flight request per registry over a kept-alive connection, which is also faster than parallel connections that get reset. RIPE NCC limits daily fetches of records containing personal data; query for the network only and skip the referenced person objects. LACNIC redirects Brazilian and Mexican space to national registries; follow the redirect. Send a User-Agent that names your organisation.
Inside your own pipeline, put the registry clients behind a semaphore so that a burst of two hundred URLs from a feed does not become two hundred parallel connections to Verisign. Queue them; the registries will still answer faster than an analyst can read.
Handling the answer you did not want
A lookup can come back with nothing in a field for four different reasons, and a pipeline that treats them the same will file bad reports.
- The domain does not exist. RDAP returned 404 and DNS says NXDOMAIN. There is nothing to report to anyone; the URL is dead or was never live. Close the case, do not send.
- The registry publishes nothing useful. The domain is live but the ccTLD gives no registrar contact. Route to the hosting network only.
- Registration data is not available under the registry's terms. Same handling as above, and say so in the case notes.
- The upstream lookup failed. A registry timed out. This is a retry, not a conclusion. Requeue with a delay rather than routing on partial data.
Whatever produces your lookups should tell you which of these happened. If it only returns null, you will end up guessing, and the guesses become reports to the wrong place.
The CDN case
When the resolved IP belongs to Cloudflare, Fastly, Akamai, CloudFront or another proxy, the network contact you have reaches the proxy, not the host. The routing rule flips: registrar first, proxy's abuse form second, host third once it is known. A pipeline that cannot tell a proxy from a host will send every Cloudflare-fronted phish to abuse@cloudflare.com and wait. Classify on the network owner, the CNAME chain and the nameservers, and carry an explicit "origin obscured" flag on the case. The CDN guide has the detail.
Where the human stays
Automate the lookup, the enrichment, the report drafting and the dispatch. Do not automate the decision to send a registrar suspension request. The one judgement a machine gets wrong most expensively is "registered for this attack" versus "legitimate site that has been compromised", and a wrong suspension request takes a real business offline and burns your credibility with the registrar. Registration date, URL path and a glance at the site's front page settle it in seconds for a person. Present those three facts prominently and make the analyst click.
Everything downstream of that click can be automatic: the report to the host goes immediately, the registrar report goes if the analyst marked the domain as malicious, the blocklist submissions go for any confirmed phishing URL.
Record where every report went
Store, per case and per report: recipient role (registrar, host, CDN, blocklist), the address used, the timestamp, the ticket reference if one comes back, and when the content was observed down. Three things fall out of that record. You can answer "did we report this?" in a second. You can measure time to takedown per recipient and learn which registrars and hosts act on first contact. And when a customer or regulator asks what you did about an incident, the answer is a query, not an archaeology exercise.
Measure the right thing
Lookups per second is not the metric. The metrics that reflect whether the pipeline works are: time from URL ingest to first report sent; share of cases where the first report went to the party that eventually acted; and time from first report to observed takedown, broken down by recipient. The first tells you if enrichment is fast enough. The second tells you if routing is right. The third tells you who to lean on.
Build or buy
The lookup layer is a few weeks of work to build and an ongoing cost to keep working: bootstrap files change, registries alter formats, one of them starts returning a number as a string and every Brazilian lookup silently fails. If your team enjoys that maintenance, the sources are free and this guide and the RDAP guide are enough to start. If it does not, a service that returns the routed answer with an explicit status for each field, and that has already asked the registries for permission to use their data commercially, saves the engineering and the correspondence. Either way, the decisions above are yours to make, and they matter more than where the JSON comes from.
AbuseRoute is a private API that returns the registrar and hosting abuse contacts for a domain in one call, for security and abuse teams. How it works. For individual manual lookups, use the RrSG's ACID Tool.